This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A258080 a(n) = ((n concatenated with n+1) + (n+1 concatenated with n)) mod n*(n+1). 1
 1, 1, 5, 19, 1, 17, 53, 43, 29, 31, 79, 29, 179, 199, 11, 69, 169, 317, 139, 361, 185, 497, 331, 149, 601, 439, 263, 73, 739, 581, 411, 229, 35, 1019, 871, 713, 545, 367, 179, 1621, 1495, 1361, 1219, 1069, 911, 745, 571, 389, 199, 1, 2447, 2337, 2221, 2099 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Peter J. C. Moses, Table of n, a(n) for n = 1..2000 MATHEMATICA Map[Mod[FromDigits[Flatten[{#1, #2}]]+FromDigits[Flatten[{#2, #1}]]&[IntegerDigits[#+1], IntegerDigits[#]], # (#+1)]&, Range[100]] (*Peter J. C. Moses, May 19 2015*) PROG (PARI) a(n) = (eval(concat(Str(n), Str(n+1))) + eval(concat(Str(n+1), Str(n)))) % (n*(n+1)); \\ Michel Marcus, Jun 04 2015 CROSSREFS Cf. A001704 (concatenation {n,n+1}). Sequence in context: A139243 A139237 A317541 * A318181 A274995 A089082 Adjacent sequences:  A258077 A258078 A258079 * A258081 A258082 A258083 KEYWORD nonn,base AUTHOR Vladimir Shevelev, May 19 2015 EXTENSIONS More terms from Peter J. C. Moses, May 19 2015 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 20 11:10 EDT 2019. Contains 322309 sequences. (Running on oeis4.)